Sofia Martinez
Plastic is notoriously difficult to recycle, with only around 9% of all plastic waste ever produced having been recycled. The most challenging plastics to recycle include black plastics, #3 PVC (polyvinyl chloride), #6 PS (polystyrene), and #7 PC (polycarbonate). These plastics are not only highly toxic but also difficult to process due to their dark pigments, which cannot be read by optical sorters at recycling facilities. Other types of plastic, such as PET (polyethylene terephthalate), are much easier to recycle and are widely accepted at recycling centers worldwide. Despite this, the global recycling rate for PET is still below 50%, highlighting the need for improved recycling technologies and practices.
| Characteristics | Values |
|---|---|
| Hardest plastics to recycle | #6 PS (polystyrene), #3 PVC (polyvinyl chloride), #7 PC (polycarbonate), black plastics |
| Why it's hard to recycle | Toxic components pose multiple health risks to humans and other organisms |
| Toxic components | #3 PVC has been evidenced to be a carcinogen that can cause rare liver cancer, disrupt male endocrine systems, cause short-term lung irritation and dizziness, induce reproductive and birth defects, impair child development, and suppress one's immune system |
| #7 PC can contain highly dangerous BPA (Bisphenol A) which can affect the reproductive system, raising the consumer's risk for cancer | |
| Black plastics contain toxic chemicals that can leach into food and drink when exposed to heat | |
| Black plastics cannot be "read" by optical sorters at recycling facilities, so they must be sorted manually, increasing sorting costs | |
| Other hard-to-recycle plastics | Crisp packets, salad bags, plastic wrap, cling film, blister packaging, plastic-coated wrapping paper, bioplastics, composite plastic |
| Why plastic recycling is challenging | More than 10,000 different additives are used to give plastics different colours and technical properties, resulting in unpredictable and suboptimal additive combinations when recycled |
| The long polymer chains that make up plastics become slightly shorter each time they are melted down, resulting in recycled plastic that is almost always of lower quality than primary plastic | |
| Different types of plastic don't mix well when melted down, and small amounts of the wrong type can degrade the quality of a whole batch, requiring careful sorting | |
| Plastic recycling can be costly and non-beneficial due to low efficiencies, and small quantities of plastics may not be economical to recycle |
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What You'll Learn
- Polystyrene, black plastics, PVC and polycarbonate are the most toxic and hardest to recycle
- PET is the most easily recyclable plastic
- LDPE is more difficult to recycle than PET or HDPE but is widely used
- Bioplastics, composite plastic, plastic-coated paper and polycarbonate are non-recyclable
- Plastic bags can be reused multiple times before disposal
Polystyrene, black plastics, PVC and polycarbonate are the most toxic and hardest to recycle
Polystyrene, black plastics, PVC, and polycarbonate are among the hardest plastics to recycle. They are also the most toxic.
Polystyrene, or styrofoam, is commonly used for takeout containers, disposable coffee cups, and packaging. While it can technically be recycled, most municipal sorting facilities do not have the capability to sort it, and it often ends up in landfills. It is also harmful to human health, with styrene, a primary component of polystyrene, considered a "probable carcinogen" by the World Health Organization.
Black plastics, which account for 15% of all plastic recyclables, are difficult to recycle due to their colour. The technology used by recycling facilities to sort plastics relies on infrared light, which carbon black, the substance that gives black plastic its colour, absorbs. As a result, black plastics often go undetected and are not sorted for recycling. They are also more likely to contain unregulated amounts of toxic chemicals and heavy metals, which can leach into food and pose a hazard to human health.
PVC, or polyvinyl chloride, is a type of plastic that is challenging to recycle due to its chemical composition and the presence of toxic additives. While some companies specialize in recycling PVC, it often requires specific collection and processing methods.
Polycarbonate, a type of plastic with impact and heat resistance, can be recycled but requires proper waste management services to transport the materials to recycling centres. It is made from oil, which makes it a valuable material for plastic recycling factories. The recycling process involves sorting, shredding, washing, and turning it into a granulate that can be used by manufacturers.
Overall, these plastics pose unique challenges to the recycling process due to their specific characteristics, whether it be their colour, chemical composition, or the presence of toxic additives. Proper disposal and recycling methods are essential to minimize their environmental and health impacts.
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PET is the most easily recyclable plastic
Polyethylene terephthalate, or PET, is the most easily recyclable plastic. It is a clear, durable, lightweight, and versatile plastic that can be recycled into its original uses. PET is the most widely recycled plastic in the world, with approximately 7.5 million tons of PET collected worldwide in 2011. The majority of beverage bottles now include recycled plastic, and companies are working to increase this number by getting every bottle back for recycling.
PET plastic is recognised by the number 1 inside the triangle formed by three arrows, which facilitates the recycling process by helping with the separation of materials. Its purity simplifies the separation process, and as a thermoplastic, it can be melted and moulded multiple times without losing quality. This makes it a material of great economic value for the recycling industry.
The process of recycling PET typically involves crushing and grinding the plastic into small pieces that can be reprocessed. These pieces can then be transformed into flakes that are spun as a yarn and used to create new products such as polar fleece clothing, backpacks, and carpets. Alternatively, PET bottles can be recycled into new PET bottles, as the plastic can be recycled into the same form repeatedly.
Using recycled PET (rPET) instead of new plastic reduces environmental impact. When used to make new bottles, total energy consumption is reduced by 79%, and greenhouse gas emissions are limited by 67%. In addition to bottles, rPET can be used in a variety of products, including shampoo bottles, cosmetic caps, packaging films, playground equipment, and construction materials.
While PET is the most easily recyclable plastic, other plastics such as polystyrene (PS), polyvinyl chloride (PVC), polycarbonate (PC), and black plastics are considered among the most difficult and toxic to recycle. These plastics contain harmful substances and pose multiple health and environmental risks, making them challenging to recycle and potentially harmful to humans and other organisms if not properly disposed of.
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LDPE is more difficult to recycle than PET or HDPE but is widely used
LDPE, or low-density polyethylene, is more difficult to recycle than PET or HDPE. LDPE is a type of thermoplastic made from the monomer ethylene, and its flexibility makes it ideal for manufacturing films, bags, and other packaging materials. However, it is less transparent than other plastics, which can make it harder to sort during the recycling process. LDPE also contains toxic substances like aldehydes, ketones, and carboxylics, making it more challenging to recycle safely.
In contrast, PET (polyethylene terephthalate) is one of the most widely recycled plastics globally. It is highly recyclable, strong, lightweight, and accepted by most recycling programs. PET is commonly used in single-use consumer packaging for drinks and food, and its transparency allows consumers to see the product inside the bottle. The mechanics of PET recycling are straightforward, involving sorting, washing, shredding, and melting. This simplicity encourages its recyclability, and recycled PET can be transformed into new bottles, fashion items, and even construction materials.
HDPE, or high-density polyethylene, is also widely accepted at recycling centers worldwide. It is one of the easiest plastic polymers to recycle, with around 30 million tons recycled annually. HDPE is versatile and rigid, making it suitable for various applications, including packaging for household chemicals, detergent bottles, and milk bottles. Its chemical resistance and durability enhance its recyclability.
Despite being more challenging to recycle, LDPE is still widely used in different industries due to its unique properties. It is flexible, making it ideal for squeeze bottles and flexible packaging. LDPE also has a lower density than HDPE, making it a suitable alternative for specific applications. Additionally, recycling LDPE results in the most greenhouse gas savings among the three types of plastics, providing an environmental incentive for its reuse.
While LDPE poses more recycling challenges than PET or HDPE, ongoing innovations in recycling technologies and closed-loop recycling programs are improving the recyclability of all plastics. These advancements aim to keep waste out of landfills and give new life to used plastics, including LDPE.
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Bioplastics, composite plastic, plastic-coated paper and polycarbonate are non-recyclable
While recycling plastic is critical to improving the environment and bettering waste management solutions, not all plastics are created equal when it comes to recyclability. Bioplastics, composite plastic, plastic-coated paper, and polycarbonate are some non-recyclable materials that pose challenges to the recycling process.
Bioplastics, often touted as an eco-friendly alternative to traditional plastics, come with their own set of complexities. While they offer advantages like biodegradability, reduced use of fossil fuels, and a smaller carbon footprint, they require high-temperature industrial composting facilities to break down effectively. However, most cities lack the necessary infrastructure, resulting in bioplastics ending up in landfills. In anaerobic conditions, they can release methane, a potent greenhouse gas. Additionally, improper disposal of bioplastics can contaminate batches of recycled plastic, hindering the overall recycling process.
Composite plastic, or plastic combined with other materials, presents another recycling challenge. When plastic is mixed with other substances, such as food or paper, it becomes contaminated, rendering the resins unsuitable for reuse. The recycling process requires separating these materials, which can be complex and costly, often making it economically unviable to recycle composite plastic.
Plastic-coated paper is another tricky material to recycle. The coating is often made from petroleum-based plastics, which are challenging to separate from the paper during the recycling process. As a result, plastic-coated paper is frequently non-recyclable and ends up in landfills or incinerators, contributing to environmental pollution.
Polycarbonate, a strong and lightweight plastic, can be recycled through melting and shredding processes. However, it requires specific industry-specific locations or niche recycling centers for proper disposal. If not recycled correctly, polycarbonate can contribute to the growing problem of plastic pollution, as it does not naturally biodegrade.
While these materials present recycling challenges, it's important to note that advancements in technology and increasing environmental awareness are driving the development of innovative solutions. Organizations and companies are actively exploring alternatives to traditional plastics and ways to improve the recyclability of these complex materials.
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Plastic bags can be reused multiple times before disposal
It is important to note that not all plastic bags are created equal. Some plastic bags, such as those made from compostable or biodegradable materials, should not be placed in recycling containers for plastic bags as they will interfere with the recycling process. These types of bags are only compostable in industrial facilities equipped to handle them.
To reduce the use of disposable shopping bags, it is recommended to use a reusable bag or container when shopping. Reusable bags may be made from various materials, such as hemp fiber or cotton, but the most common type is non-woven polypropylene (PP), which is more durable and cost-effective than cotton. It is important to consider the material, its origins, and how often you will reuse the bag when choosing a reusable option.
If you have plastic bags that you cannot reuse, you can try to recycle them at stores or other drop-off sites, but only if they are clean and dry. Many grocery stores offer plastic bag recycling options on-site. However, unlike metal or glass, plastic can only be recycled a limited number of times before it becomes too costly to revive.
The most widely recycled plastic in the world is PET, which is relatively easy to recycle. However, some countries are still struggling to reach decent recycling rates for PET. Other types of plastic, such as PVC and PC, are considered among the most toxic plastics to produce and the most difficult to recycle due to their harmful components.
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Frequently asked questions
There are several types of plastics that are considered difficult to recycle, including polystyrene (#6 PS), polyvinyl chloride (#3 PVC), polycarbonate (#7 PC), and black plastics. These plastics often contain toxic substances and have negative impacts on human health and the environment.
The recycling process for plastics typically involves sorting, shredding, and melting the plastic into pellets that can be sold to producers. However, different types of plastics do not mix well when melted, and small amounts of certain plastics can degrade the quality of the recycled product. Additionally, the sorting process for black plastics is challenging as optical sorters cannot read the dark pigment, requiring manual sorting which increases costs.
Polystyrene (#6 PS), polyvinyl chloride (#3 PVC), and polycarbonate (#7 PC) are considered among the most toxic plastics to produce. They release harmful chemical byproducts during manufacturing, contaminating the air, water, and surrounding communities. These plastics also pose multiple health risks to humans and other organisms, including cancer, endocrine disruption, and developmental issues.
To reduce the use of hard-to-recycle plastics, it is important to avoid products made from these materials, such as polystyrene in yogurt containers and packaging fillers, and polyvinyl chloride in door frames and credit cards. Instead, opt for reusable alternatives or products made from more recyclable materials. Additionally, support initiatives and businesses that focus on sustainable practices and the reduction of single-use plastics.
While recycling is the preferred method for plastic waste management, some hard-to-recycle plastics can be repurposed or reused. For example, plastic bags can be reused multiple times before disposal, and some companies are exploring innovative techniques to improve the recyclability of certain plastics, such as post-consumer PET/PE multilayer food packaging.
